CN103820785A - Quaternary compound gas-phase corrosion inhibitor for carbon steel and preparation method for quaternary compound gas-phase corrosion inhibitor - Google Patents
Quaternary compound gas-phase corrosion inhibitor for carbon steel and preparation method for quaternary compound gas-phase corrosion inhibitor Download PDFInfo
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- CN103820785A CN103820785A CN201410040833.0A CN201410040833A CN103820785A CN 103820785 A CN103820785 A CN 103820785A CN 201410040833 A CN201410040833 A CN 201410040833A CN 103820785 A CN103820785 A CN 103820785A
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- ala
- carbon steel
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Abstract
The invention discloses a quaternary compound gas-phase corrosion inhibitor for carbon steel. The quaternary compound gas-phase corrosion inhibitor is formed by dissolving 0.8-1.2 g/L sodium silicate, 1.8-2.3 g/L alanine, 6.8-8.3 g/L sodium benzoate and 6.9-8.1 g/L urea into distilled water according to the mass-volume concentration. The preparation method for the corrosion inhibitor comprises the steps of respectively weighing the sodium silicate, the alanine, the sodium benzoate and the urea according to the mass-volume concentration, dissolving the materials through the distilled water with the 1/4 volume respectively, and uniformly stirring; respectively stewing the four solutions, and mixing and uniformly stirring the solutions. The quaternary compound gas-phase corrosion inhibitor is compounded by the sodium silicate, the alanine, the sodium benzoate and the urea, so that the quaternary compound gas-phase corrosion inhibitor is green, environment-friendly, high in efficiency and low in environment pollution and has a good synergistic effect; the problems of low corrosion inhibition property and high pollution of the conventional gas-phase corrosion inhibitor are solved; the preparation method is simple and is convenient to use; the corrosion inhibition rate of the carbon steel can be increased, and the service life of the carbon steel is prolonged.
Description
Technical field
The invention belongs to metal vapor phase rust-proofing technical field, be specifically related to a kind of quaternary built vapour-phase inhibitor for carbon steel, the invention still further relates to the preparation method of this inhibiter.
Background technology
Volatile rust prevention packing technique, exactly at packaging vessel or seal space up for safekeeping and place a certain amount of vapour-phase inhibitor (Volatile Corrosion Inhibitor is called for short VCI), or scribble volatile rust preventive paper and the gas phase plastics film of vapor phase inhibitor, its vapor phase inhibitor constantly slowly volatilizes antirust gas, form certain vapour pressure, be full of and seal space up for safekeeping, even equip the gap of element, effectively suppress metal parts corrosion, the method is called again that gas phase is sealed up for safekeeping or vapor phase inhibitor technology.
Conventional gas-phase rustproof packaging material is paid close attention to widely to the harm of environment and human body, in order to meet the requirement of cleaner production and Sustainable development, the requirement of vapour-phase inhibitor is constantly improved.The vapour-phase inhibitor of having developed, commercial less, the inorganic acid salt or the organic acid salt that in the formula of the volatile rust prevention product of commercial applications, are mainly at present amine, the organic amines such as dicyclohexyl amine nitrite, cyclohexylamine carbonate rely on its good corrosion inhibition in occupation of dominant position.Phosphate corrosion inhibitor was because price advantage was once widely used, but the discharge of phosphoric acid salt sewage can make river, lake occur the phenomenon of red tide.Research shows, single-component vapour-phase inhibitor has good rustless property to carbon steel, but the corrosion inhibition of single-component inhibiter has certain limitation, and corrosion mitigating effect is poor.
Summary of the invention
The object of this invention is to provide a kind of quaternary built vapour-phase inhibitor for carbon steel, solved poor, large to the environmental hazard problem of existing vapour-phase inhibitor corrosion inhibition.
Another object of the present invention is to provide the preparation method of above-mentioned inhibiter.
The technical solution adopted in the present invention is: for the quaternary built vapour-phase inhibitor of carbon steel, be 0.8g/L～1.2g/L water glass by quality-volumetric concentration, 1.8g/L～2.3g/L L-Ala, 6.8g/L～8.3g/L Sodium Benzoate, 6.9g/L～8.1g/L urea is dissolved in distilled water composition.
Another technical scheme that the present invention takes is that the preparation method of above-mentioned inhibiter, comprises the following steps:
Step 1, according to the volume of required inhibiter, takes respectively 0.8g/L～1.2g/L water glass by quality-volumetric concentration, 1.8g/L～2.3g/L L-Ala, 6.8g/L～8.3g/L Sodium Benzoate and 6.9g/L～8.1g/L urea;
Step 2, the water glass that step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of its 1/4 volume respectively, stir, and obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively, then these four kinds of solution are mixed and are stirred, and to obtain final product.
Feature of the present invention is also,
The churning time of step 2 mesosilicic acid sodium, L-Ala, Sodium Benzoate, urea soln is 5～10min.
The time of repose of step 3 mesosilicic acid sodium solution, L-Ala solution, PhCOONa solution, urea soln is 4～6min.
The invention has the beneficial effects as follows: the present invention is for the quaternary built vapour-phase inhibitor of carbon steel, use water glass, L-Ala, Sodium Benzoate and urea to carry out composite, this quaternary built vapour-phase inhibitor environmental protection, efficient, environmental pollution is little, and there is good synergy, solved poor, large to the environmental hazard problem of existing vapour-phase inhibitor corrosion inhibition, preparation method is simple, easy to use, can improve the corrosion inhibition rate of carbon steel, extend the work-ing life of carbon steel.
Accompanying drawing explanation
Fig. 1 figure that affects on corrosion inhibition rate that is the present invention for the different urea concentrations of quaternary built vapour-phase inhibitor of carbon steel.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention, for the quaternary built vapour-phase inhibitor of carbon steel, is 0.8g/L～1.2g/L water glass by quality-volumetric concentration, 1.8g/L～2.3g/L L-Ala, and 6.8g/L～8.3g/L Sodium Benzoate, 6.9g/L～8.1g/L urea is dissolved in distilled water composition.
The preparation method of above-mentioned inhibiter, comprises the following steps:
Step 1, according to the volume of required inhibiter, takes respectively 0.8g/L～1.2g/L water glass by quality-volumetric concentration, 1.8g/L～2.3g/L L-Ala, 6.8g/L～8.3g/L Sodium Benzoate and 6.9g/L～8.1g/L urea;
Step 2, the water glass that step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of its 1/4 volume respectively, stir 5～10min, obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively 4～6min, then these four kinds of solution are mixed and are stirred, and to obtain final product.
The effect of each component of inhibiter:
Water glass: molecular formula Na
2siO
4, it is a kind ofly known carbon steel to be had to the environmentally friendly inhibiter of good corrosion inhibition.Water glass inhibiter has strong avidity one-tenth branch in metallic surface forms one deck densification, stable protective membrane in metallic surface, make that metal and corrosive environment are isolated to be opened, and rate of metal corrosion is decline thereupon also.This is because silicate and ironing surface oxide compound react, generating portion Fe
2o
3, Fe
2siO
4and Fe
7siO
10, these newly-generated materials have stronger resistance to corrosion.
L-Ala: molecular formula C
3h
7o
2n, skeleton symbol is CH
3-CH (NH
2)-COOH, is an amino monoprotic acid, is the inhibiter of known amino acids.α-alanine also claims 2-alanine, and more than 200 ℃ distillation, decomposes between 264～296 ℃ with rate of heating difference, how from fermentation method and natural product, to extract at present.Amino acid is the inhibiter of precipitation membranous type, and amino acids vapour-phase inhibitor, in the mode of chemisorption, forms protective membrane in metallic surface; L-Ala inhibitor molecular forms coordinate bond by nitrogen-atoms and iron atom; thereby formation chemisorption, forms protective membrane, has certain corrosion inhibition.Amino acids inhibiter is to have the amphoteric substance that alkalescence is amino and acidity is amino concurrently, and they can all decompose at occurring in nature, are a kind of vapour-phase inhibitors of environmental protection.
Sodium Benzoate: claim again sodium benzoate, molecular formula is C
7h
5o
2na, structural formula is C
6h
5cOONa.Sodium Benzoate is the food preservatives being in daily use, little to environmental hazard.Sodium Benzoate is mainly to form adsorption film in metallic surface, thereby metal is had to corrosion mitigating effect.When Sodium Benzoate mass concentration hour, the adsorption film that metallic surface forms is imperfect, and along with mass concentration increases, it is complete that the adsorption film of metallic surface is tending towards gradually, corrosion mitigating effect can increase greatly.
Urea: molecular formula is CO (NH
2)
2, from the chemical structure of urea, urea has diamine base, and lone-pair electron can be provided, and can be adsorbed on metallic surface, can play certain provide protection to corrosion of metal.The existence of urea makes the aqueous solution show weakly alkaline, the OH that urea dissociation goes out
-ion is the principal element that affects metallic corrosion behavior, OH
-the increase of ionic concn makes alloy surface more easily form the protective membrane with certain protective role, and corrosion speed reduces.Urea is odorless, tasteless, nontoxic, can absorb moisture and deliquescence is soluble in water in air, can distil in a vacuum, and ferrous metal liquid is had to certain corrosion inhibition.
The present invention is for the quaternary built vapour-phase inhibitor of carbon steel, use water glass, L-Ala, Sodium Benzoate and urea to carry out composite, this quaternary built vapour-phase inhibitor environmental protection, efficient, environmental pollution is little, and have good synergy, solved poor, large to the environmental hazard problem of existing vapour-phase inhibitor corrosion inhibition, preparation method is simple, easy to use, can improve the corrosion inhibition rate of carbon steel, thereby lower the erosion rate of carbon steel, extend the work-ing life of carbon steel.
Embodiment 1
Step 1, configuration 1L inhibiter, takes respectively 1g water glass, 2g L-Ala, 8g Sodium Benzoate and 7g urea;
Step 2, the water glass that step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of 250mL respectively, stir 5min, obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively 5min, then these four kinds of solution are mixed and are stirred, and to obtain final product.
The inhibiter making is no more than in time of 24 hours, is coated on anti-rust base paper or plastics film, be made into volatile rust preventive paper or gas-phase antirusting film; Clean, level and smooth, dry, non-corroding state will be processed into by antirust steel surface again; Finally, by volatile rust preventive paper or gas-phase antirusting film parcel steel surface, and sealed interface place, and directly contact between volatile rust preventive paper or gas-phase antirusting film and carbon steel.
The corrosion inhibition rate of the volatile rust preventive paper that the VCI-146 type volatile rust preventive paper produced in USA of selling on the quaternary built inhibiter coating volatile rust preventive paper that the embodiment of the present invention 1 is obtained and market and water glass, L-Ala and Sodium Benzoate ternary built inhibiter are made contrasts, result is as shown in table 1: when water glass: L-Ala: Sodium Benzoate: urea concentration reaches 92.14% to the corrosion inhibition rate of 45# steel when for 1:2:8:7, is 95.00% to the corrosion inhibition rate of A3 steel; In addition, do not add urea, and when water glass: L-Ala: sodium benzoate concentration is when for 1:2:8, ternary built inhibiter is 88.77% to the corrosion inhibition rate of 45# steel, be 91.01% to the corrosion inhibition rate of A3 steel, while showing water glass, L-Ala, Sodium Benzoate and urea as quaternary built vapour-phase inhibitor, urea has good synergy, and corrosion inhibition rate and VCI-146 inhibiter approach.
Fig. 1 is when water glass: L-Ala: when sodium benzoate concentration ratio is 1:2:8, the impact of different urea concentrations on corrosion inhibition rate, can find out, in the time that urea concentration is 6.9g/L～8.1g/L, corrosion inhibition rate is higher, in the time that urea concentration is 7g/L, the corrosion inhibition rate of 45# steel is up to 92.14%, the corrosion inhibition rate of A3 steel is up to 95.00%.
The rust-proof effect contrast of the different inhibiter of table 1 to 45# steel and A3 steel
Embodiment 2
Step 1, configuration 1L inhibiter, takes respectively 0.8g water glass, 1.8g L-Ala, 6.8g Sodium Benzoate and 6.9g urea;
Step 2, the water glass that step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of 250mL respectively, stir 7min, obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively 4min, then these four kinds of solution are mixed and are stirred, and to obtain final product.
Embodiment 3
Step 1, configuration 1L inhibiter, takes respectively 1.2g water glass, 2.3g L-Ala, 8.3g Sodium Benzoate and 8.1g urea;
Step 2, the water glass that step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of 250mL respectively, stir 10min, obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively 6min, then these four kinds of solution are mixed and are stirred, and to obtain final product.
Embodiment 4
Step 1, configuration 1L inhibiter, takes respectively 1.1g water glass, 2.2g L-Ala, 7.3g Sodium Benzoate and 7.6g urea;
Step 2, the water glass that step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of 250mL respectively, stir 8min, obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively 5min, then these four kinds of solution are mixed and are stirred, and to obtain final product.
Claims (4)
1. for the quaternary built vapour-phase inhibitor of carbon steel, it is characterized in that, is 0.8g/L～1.2g/L water glass by quality-volumetric concentration, 1.8g/L～2.3g/L L-Ala, and 6.8g/L～8.3g/L Sodium Benzoate, 6.9g/L～8.1g/L urea is dissolved in distilled water composition.
2. for the preparation method of the quaternary built vapour-phase inhibitor of carbon steel, it is characterized in that, comprise the following steps:
Step 1, according to the volume of required inhibiter, takes respectively 0.8g/L～1.2g/L water glass by quality-volumetric concentration, 1.8g/L～2.3g/L L-Ala, 6.8g/L～8.3g/L Sodium Benzoate and 6.9g/L～8.1g/L urea;
Step 2, the water glass that described step 1 is taken, L-Ala, Sodium Benzoate and urea dissolve with the distilled water of its 1/4 volume respectively, stir, and obtain respectively sodium silicate solution, L-Ala solution, PhCOONa solution and urea soln;
Step 3, the sodium silicate solution that described step 2 is obtained, L-Ala solution, PhCOONa solution and urea soln leave standstill respectively, then these four kinds of solution are mixed and are stirred, and to obtain final product.
3. the preparation method of the quaternary built vapour-phase inhibitor for carbon steel as claimed in claim 2, is characterized in that, the churning time of described step 2 mesosilicic acid sodium, L-Ala, Sodium Benzoate, urea soln is 5～10min.
4. the preparation method of the quaternary built vapour-phase inhibitor for carbon steel as claimed in claim 2, is characterized in that, the time of repose of described step 3 mesosilicic acid sodium solution, L-Ala solution, PhCOONa solution, urea soln is 4～6min.
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| CN106086898A (en) * | 2016-08-20 | 2016-11-09 | 哈尔滨锅炉厂有限责任公司 | Volatile rust prevention powder of carbon steel and low alloy steel and preparation method thereof |
| CN112267118A (en) * | 2020-10-26 | 2021-01-26 | 万华化学集团股份有限公司 | Vapor phase corrosion inhibitor for protection during maintenance of chemical equipment and preparation method thereof |
| US11149202B1 (en) | 2016-12-13 | 2021-10-19 | Ecolab Usa Inc. | Tetracarboxylic acid combinations for corrosion inhibition |
| CN113529089A (en) * | 2021-07-02 | 2021-10-22 | 北京首融汇科技发展有限公司 | Environment-friendly vapor phase corrosion inhibitor and vapor phase antirust material |
| CN113755844A (en) * | 2021-09-18 | 2021-12-07 | 西安热工研究院有限公司 | Vapor phase corrosion inhibitor suitable for carbon steel in marine atmospheric environment and preparation method thereof |
| CN115074738A (en) * | 2022-06-13 | 2022-09-20 | 山东国智新材料科技有限公司 | Environment-friendly multi-component composite vapor phase corrosion inhibitor and preparation method thereof |
| CN115584506A (en) * | 2021-07-05 | 2023-01-10 | 天津科技大学 | Preparation method of green efficient compound vapor phase corrosion inhibitor for carbon steel |
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| CN115074738A (en) * | 2022-06-13 | 2022-09-20 | 山东国智新材料科技有限公司 | Environment-friendly multi-component composite vapor phase corrosion inhibitor and preparation method thereof |
| CN115074738B (en) * | 2022-06-13 | 2024-03-08 | 山东国智新材料科技有限公司 | Environment-friendly multi-element composite vapor phase corrosion inhibitor and preparation method thereof |
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